鉄の不均質核生成におよぼす酸化物の影響

概要

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As a part of the study on the effect of oxides on heterogenuous nucleation during iron solidification, the effects of Al_2O_3, SiO_2, and rare earth oxides were examined, by measuring the critical supercooling of 300 g electrolytic iron under special slag in a Tammann furnace. The following results have been obtained. 1) The critical supercooling for heterogenuous nucleation is remarkably lowered than that of homogenuous nucleation. This value is 3℃ by the addition of R.E.M, and this is extremely small when compared with 14℃ by Al_2O_3, 30℃ by SiO_2, and 53℃ by MnO. 2) The heterogenuous nucleating potency of oxide catalyzers is dependent upon the difference of interfacial energy between the oxide substrate and δ-Fe. This interfacial energy can be theoretically explained by the disregistry between both crystals.
社団法人日本鉄鋼協会の論文
1976-05-01